Hngls and skyblue please continue to give further impression of the Spa1. I got Mr. Linennberg to spill some more characteristic of the amp. Laid back and warm sound is he said best describe the sound signature. " All of our gear has a laid back sound placing emphasis on nothing but the music. You will easily find gear from other brand giving you more bass, more mids, more highs, more false dynamic and so on, but you will notice very soon that this gear is robbing your nerves and listening fatigue occurs." He also mentioned some feedback loop in the circuit of the amp to produce it house soundEdited by Neogeo333 - 3/19/12 at 4:01am

Ah, still breaking-in. since It arrived to me 10 days ago ; short listen to it yesterday, and my ears tell me at this early stage the unit is still half roasted ... still need another week or so for it to go full throttle.
Nevertheless, with past experience in using V200 & Burson ( that kind of stuff ) this spa1 sounds to me simply belongs to another league.
Its exterior may not match the V200 cosmestic, while way ahead if compare to Buxxxx, internally the spa1 should belongs to an end to some DIY modifier with realistic sense. I only find the level control a bit too coarse for precise sound level adjustment, but with the absolutely clean power it provide there is always a tendency to turn a bit louder, or simply accept the way it is ... well, we are in real world and nothing created by human is perfect :-)). Afterall it is only a machine / or consumer product !!
Soundwise, ah, this is tricky to describe in terms of high/mid/low section separately, let me run the it longer for some solid comment.

By the way, my system has Marantz SA-7, Metronome cd, V800 dac, T1, HD-800, LCD-2, all baalanced cable ... and many more hi-fi accessories.